I thought My-HiME had a lot of seiyuu. This one tops it!
Kikuchi Mika (Arika Yumemiya), Koshimizu Ami (Nina Wang), Yukana (Mashiro Blan de Windbloom)
Kuribayashi Minami (Erstin Ho), Chiba Saeko (Natsuki Kruger), Shindou Naomi (Shizuru Viola)
Iwao Junko (Akane Soir), Saiga Mitsuki (Chie Hallard), Nogawa Sakura (Shiho Huit)
Yuzuki Ryouka (Haruka Armitage), Noto Mamiko (Yukino Chrysant), Higa Kumiko (Irina Woods)
Tanaka Rie (Tomoe Marguerite), Koyama Kimiko (Yayoi Alter), Itsuki Yui (Miya Clochette)
Shimizu Ai (Mikoto), Shintani Ryouko (Aoi Senoh), Inoue Kikuko (Yukariko Steinberg)
Kimura Akiko (Yohko Helene, Ririe Adein), Ishida Akira (Nagi Dai Artai), Asai Kiyomi (Miyu)